Incentive Plan - Schedule of Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Long-term incentive units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	$ 4.2	$ 3.1
Deferred compensation, capitalized	0.1	0.1
Unearned Compensation	$ 26.7		$ 15.1
Expected period to recognize unearned compensation (in years)	2 years 6 months
Market performance-based awards
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	$ 6.2	4.7
Deferred compensation, capitalized	0.4	0.2
Unearned Compensation	$ 52.9		34.4
Expected period to recognize unearned compensation (in years)	2 years 6 months
Service-Based Restricted Stock Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	$ 6.0	3.2
Deferred compensation, capitalized	0.7	0.8
Unearned Compensation	$ 64.9		41.5
Expected period to recognize unearned compensation (in years)	3 years
Interxion awards
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	$ 10.5	$ 3.0
Unearned Compensation	$ 16.4		$ 27.2
Expected period to recognize unearned compensation (in years)	2 years 1 month 6 days